Microstructure and mechanical behavior of porous sintered steels

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Selective Laser Melting of Duplex Stainless Steel Powders: An Investigation (2016, background): “These pores do not affect the density too adversely, as they are smaller in size and less frequent and also have reduced stress levels than irregular shaped pores as Chawla and Deng [56] report with the sintering of steel powder.”
Identifying the Development State of Sintered Silver (Ag) as a Bonding Material in the Microelectronic Packaging Via a Patent Landscape Study (2016, background): “F is the form factor; A is the measured pore area; and P is the measured pore perimeter [97].”
Enhanced fatigue behavior of powder metallurgy Ti–6Al–4V alloy by applying ultrasonic impact treatment (2015, background): “3), by the following expression [9, 57]: ( ) ( ) 1 1 o E E E p pk = − +     .”
Study of the Pore Formation on CoCrMo Alloys by Selective Laser Melting Manufacturing Process (2013, background): “that irregular pores have a higher stress than perfectly round pores [12].”
Effects of hot isostatic pressing on the elastic modulus and tensile properties of 316L parts made by powder bed laser fusion (2017, methodology): “However, as with all powder-based processes, such as sintering [3], net-shape hot isostatic pressing [4], and powder compaction [5], as well as other net-shape manufacturing methods such as casting [6], there is an inherent porosity associated with the process.”